package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @Description: 自动填充切面类
 * @Author: Zonghe Wang
 * @Date: 2025/1/19 16:29
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    // 切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段填充");

        // 获取当前被拦截方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); // 方法签名对象
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();
        // 获取操作参数 -- 实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object arg = args[0];
        // 准备需要赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 根据数据库操作类型赋值 反射
        if(operationType == OperationType.INSERT) {
            // 为四个公共字段赋值
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射赋值
                setCreateTime.invoke(arg, now);
                setUpdateTime.invoke(arg, now);
                setCreateUser.invoke(arg, currentId);
                setUpdateUser.invoke(arg, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            // 为两个赋值
            Method setUpdateTime = null;
            try {
                setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setUpdateTime.invoke(arg, now);
                setUpdateUser.invoke(arg, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }
    }

}
